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UNITED STATES ARTHUR E. KENNELLY AND JOHN F. OTT,

ASSIGNORS TO THE EDISON YORK, N. Y.

OF ORANGE, NEIV JERSEY,

GENERAL ELECTRIC COMPANY, OF NEIV ELECTRO-MAGNETIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 479,169, dated July 19, 1892. Application filed October 21, 1891. Serial No. 409,380. (No model.)

To aZZ whom it may concern.-

Beit known that we, ARTHUR E. KENNELLY, a subject of the Queen of Great Britain, and JOHN F. OTT, a citizen of the United States, residing at Orange,in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Electro-Magnetic Machines, of which the following is a specification.

The present invention relates to electromagnetic machines, the main object being to provide an improved form of field-magnet, and especially for providing a field-magnet adapted to be used in connection with a ring-armature, the coils of which are wholly or partially covered with iron, forming part of the body of the armature-core.

In the accompanying drawings,illustrating the improvement, Figure l is a side view, partly in section, of our improved machine, two of the armature-coils being omitted and one being shown in section; and Fig. 2 is a face view of a short section of the armature with one coil in position and one coil omitted.

In ordinary motors and dynamosit is found that the extremities of the field-magnet poles become highly heated, when the machines are in use, by Foucault currents generated therein by the movement of the armature through the magnetic field. This may be partially overcome by laminating the pole-pieces as described in Edisons application, Serial No. 382,338, filed February 2%, 1891, and elsewhere, and by our present invention we provide an improved construction and arrangement of such pole-pieces. \Ve have found, also, that solid polepieces can be used without objectionable heating, at least in small motors, in combination with armatures consisting of a ring or cylinder having transverse partiallyinclosed passages in which the armature-coils are wound. Such solid pole-pieces are also provided for.

1 is the armature-core, and 2 the transverse passages in which the coils 3 are wound.

4 are transverse slits communicating with the passages, as shown. \Vith this construction of armature, which is substantially old, the coils wound on the core will be largely inclosed in the metal of the core, since the heads 5 of the T-shaped extensions project over the coils. The slits are sufficiently wide to allow the wire composing the coils to be passed through them when they are being wound. The outer faces of the T-shaped extensions travel in close proximity to the polepieces 6 of the machine, and which are magnetized by the coil 7. The armature-core is laminated, the laminations being secured to- 'gether by bolts 8, passing through holes 9, or

by other suitable means.

\Vhen laminated pole-pieces are employed, as above indicated, they are built up of sheetmetal stamped pieces 6, 6, &c., riveted together at 10. At the center a transverse groove 11 is formed, into which fits a strap 12, bolted to lugs 13 on the body of the fieldmagnet or on a strap surrounding said body. This forms a simple and strong mode of securing the laminated pole-pieces in place. It is evident that the same strap and connecting devices can be used in connection with solid pole-pieces, although in this case it is less necessary, since bolt-holes can be readily formed in such solid pole-pieces, so that they can be rigidly secured by bolts passing through the body of the field-magnet.

That we claim is 1. The combination, in amagnet, of a main body, a separate pole-piece, and a strap securing said body and pole-piece together, substantially as described.

2. The combinatiomin a magnet, of a main body and a laminated pole-piece, said polepiece and body being secured together by a strap passing around the pole-piece and fastened to the body, substantially as described.

3. The combination, in a magnet,of amain body and a laminated pole-piece, said polepiece and body being secured together by a strap passing around the pole-piece and fastened to the body, the pole-piece having a groove across its outer face in which the strap rests, substantially as described.

This specification signed and witnessed this 8th day of October, 1891.

ARTHUR E. KENNELLY. JOHN F. OTT.

Witnesses:

J OHN F. RANDOLPH, CHARLES M. OATLIN. 

